Does the Darcy-Buckingham Law apply to flow through unsaturated porous rock?

Water
By: , and 

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Abstract

The Darcy–Buckingham (DB) law, critical to the prediction of unsaturated flow, is widely used but has rarely been experimentally tested, and therefore may not be adequate in certain conditions. Failure of this law would imply that the unsaturated hydraulic conductivity is not constant for a given water content, as assumed in nearly all subsurface flow models. This study aims to test the DB law on unsaturated porous rock, complementing the few previous tests, all done on soils. Two lithotypes of calcareous porous rocks were tested. The quasi-steady centrifuge method was used to measure the flux density for different centrifugal driving forces while maintaining essentially constant water content, as required. Any deviations from the direct proportionality of the measured flux and the applied force would indicate a violation of the DB law. Our results show that, for the tested rocks and conditions, no physical phenomena occurred to cause a failure of the DB law. 
Publication type Article
Publication Subtype Journal Article
Title Does the Darcy-Buckingham Law apply to flow through unsaturated porous rock?
Series title Water
DOI 10.3390/w12102668
Volume 12
Issue 10
Year Published 2020
Language English
Publisher Multidisciplinary Digital Publishing Institute
Contributing office(s) WMA - Earth System Processes Division
Description 2668, 19 p.
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